title: (1S,3R,8R)-2,2-Di-chloro-3,7,7,10-tetra-methyl-tri-cyclo-[6.4.0.0(1,3)]dodec-9-en-11-one.
abstract: The title compound, C16H22Cl2O, was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzo-cyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The mol-ecule is built up from fused six- and seven-membered rings and an additional three-membered ring arising from the reaction of himachalene with di-chloro-carbene. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, whereas the seven-membered ring displays a screw-boat conformation; the dihedral angle between the rings (all atoms) is 59.65 (14)°.
authors.affiliation: Laboratoire de Chimie des Substances Naturelles, "Unité Associé au CNRST (URAC16)", Faculté des Sciences Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco.
authors.forename: Naja
authors.initials: N
authors.lastname: Ourhriss
authors.forename: Ahmed
authors.initials: A
authors.lastname: Benharref
authors.forename: Abdelouahd
authors.initials: A
authors.lastname: Oukhrib
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Daran
authors.forename: Moha
authors.initials: M
authors.lastname: Berraho